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Unnamed magnetite occurrences, Higganum, Haddam, Middlesex Co., Connecticut, USA

Magnetite
Unnamed magnetite occurrences, Higganum, Haddam, Middlesex Co., Connecticut, USA

Photo: 2010 Harold Moritz
Latitude: 41°29'56"N
Longitude: 72°33'21"W
Numerous small, common, unzoned pegmatites with pink to reddish microcline cross-cut the Monson gneiss in the Higganum area. Natural and man-made exposures are too numerous to list. Some of these pegmatites contain magnetite crytals, but little else of interest. The crystals are octahedral to dodecahedral and deeply striated and can reach 2 to 3 cm.

Davis (1901) states that they "occurs in octahedrons with truncated edges, on the summit of a hill on Crook’s Lane, Walkley Hill district, about one mile from the [old Middlesex County] turnpike. These crystals are quite abundant here and well formed, varying in size from ¼ to 1 ¼ inches. Magnetite is also met with in other parts of the town in ledges and boulders, but this locality is by far the most prolific."

They have been noted by Foye (1922) in Higganum Creek west of Depot Road:

"In the bed of the brook north of the village of Higganum (Locality 14) well formed magnetite crystals occur in red pegmatite in the Haddam [Monson] gneiss. The occurrence is only interesting in that such perfect crystals of magnetite are rare in the district."

and by Williams (1945) on Straits Hill between Higganum and Haddam center (an area similar to that described by Davis (1901)).

Map reference coordinates are for the Higganum Creek locality.

Mineral List

Albite
Annite
Magnetite
Microcline
Muscovite
Quartz
var: Smoky Quartz



6 entries listed. 5 valid minerals.

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References

Davis, James W. (1901): The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70.

Foye, Wilbur G. (1922): Mineral localities in the vicinity of Middletown. American Mineralogist v. 7, p. 4-12.

Rice, William N. and Wilbur G. Foye. (1927): Guide to the Geology of Middletown, Connecticut, And Vicinity. State Geological and Natural History Survey, Bulletin no. 41.

Williams, Horace S. (circa 1945): Article for New York Society of Mineralogists. Brainerd Public Library, Haddam, Connecticut.

Stugard, Frederick, Jr. (1958): Pegmatites Of The Middletown Area, Connecticut. USGS Bulletin 1042-Q.

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